1999 Dodge Durango Slt 4x4 Rear ABS Front ABS Will Install On Change

1999 Dodge Durango SLT 4x4 Has rear abs but not front abs. How and what will i need to install abs on the from. I need to change the bearing and hub assembly and for the same price, I can get abs on the new hub assembly. Wife has trouble stopping quickly-I thought adding front abs might help save her in the future. Any idea's and help would be sincerely appreciated